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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8a97caae8a8e7d3ba274eb4317d7fc90538612b01ad4d4adf6d55ba38313add' 
  AND token = '1Lm8bkvrkYOxzPoMzJek/WE4/UMS2PYf8TOv/1igC9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}